此文档主要是用图形用户界面，树事件的监听，用表格模型创建表格，增加或删除列（布局管理器+组件+事件），网络编程（多线程），和数据库-This document is primarily a graphical user interface, tree event listeners, using the model form to create tables, add or delete columns (layout manager+ event+ components), network programming (multithreading), and database